- hosts: localhost
  name: become_user without become play
  become_user: root

  tasks:
  - debug:
      msg: hello

- hosts: localhost

  tasks:
  - name: become_user without become task
    command: whoami
    become_user: postgres

- hosts: localhost

  tasks:
  - name: a block with become and become_user on different tasks
    block:
    - name: become
      become: true
      command: whoami
    - name: become_user
      become_user: postgres
      command: whoami